public static function get_allowed_tokens()
{
return array('front_page' => array('site_name', 'tagline'), 'posts' => array('site_name', 'tagline', 'post_title'), 'pages' => array('site_name', 'tagline', 'page_title'), 'groups' => array('site_name', 'tagline', 'group_title'), 'archives' => array('site_name', 'tagline', 'date'));
}